Do Not Use Triggers at All in .NET

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Do Not Use Triggers at All
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If you can implement the required functionality using constraints, do not use triggers!
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SQL Server 2000 Stored Procedure & XML Programming
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If you can implement the required functionality using stored procedures, and if you can prevent users from accessing your tables directly, do not use triggers! Triggers are more difficult to implement, debug, and manage. You will save both time and money for your company or your client if you can find simpler ways to implement the required functionality.
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Transaction Management in Triggers
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A trigger is always part of the transaction that initiates it. That transaction can be explicit (when SQL Server has executed Begin Transaction). It can also be implicit basically, SQL Server treats each Transact-SQL statement as a separate transaction that will either succeed completely or fail completely. It is possible to abort the entire transaction from inside the trigger by using Rollback Transaction. This command, shown in action next, is valid for both implicit and explicit transactions:
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Alter Trigger trOrderStatus_U On dbo.[Order] After Update --For Update As If @@Rowcount = 0 Return If Update (OrderStatusId) Begin Insert into ActivityLog( Activity, LogDate, UserName, Note) Select 'Order.OrderStatusId', GetDate(), USER_NAME(), 'Value changed from ' + Cast( d.OrderStatusId as varchar) + ' to ' + Cast( i.OrderStatusId as varchar) From deleted d inner join inserted i On d.OrderId = i.OrderId If @@Error <> 0 Begin
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RAISERROR ("Error in trOrderStatus_U", 16, 1) Rollback Transaction End End
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In this trigger, SQL Server investigates the presence of the error and rolls back the complete operation if it is unable to log changes to the ActivityLog table. The processing of Rollback Transaction inside a trigger differs from its processing inside a stored procedure. It also differs in different versions of Microsoft SQL Server. When a Rollback statement is encountered in a stored procedure, changes made since the last Begin Transaction are rolled back, but the processing continues. In Microsoft SQL Server 2000, when a Rollback statement is executed within a trigger, a complete batch is aborted and all changes are rolled back. SQL Server continues to process from the beginning of the next batch (or stops if the next batch does not exist). Microsoft SQL Server 7.0 and 4.2 and all versions of Sybase SQL Server behaved in this manner. In Microsoft SQL Server 6.0, execution was continued through the trigger, but the batch was canceled. Version 6.5 went to an opposite extreme. Execution of both the trigger and the batch was continued. It was the responsibility of the developer to detect an error and stop further processing.
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Using Triggers
In SQL Server, triggers may have the following roles: To enforce data integrity, including referential integrity and cascading deletes To enforce complex business rules too complex for Default and Check constraints To log changes and send notification to administrators via e-mail To maintain derived information (computed columns, running totals, aggregates, and so on) Triggers can be implemented to replace all other constraints on a table. A typical example is the use of a trigger to replace the functionality enforced by a foreign key constraint. It is possible to implement cascading deletes using triggers. For example, if you do not have a foreign key between the Inventory and InventoryProperty tables, you might implement a trigger to monitor the deletion of Inventory records and to delete all associated InventoryProperty records.
SQL Server 2000 Stored Procedure & XML Programming
Check and Default constraints are limited in that they can base their decision only on the context of current records in the current tables. You can implement a trigger that functions in a manner similar to Check constraints and that verifies on the contents of multiple records or even on the contents of other tables. Triggers can be set to create an audit trail of activities performed on a table. For example, you might be interested in obtaining information on who changed the contents of, or specific columns in, the Lease table, and when that user made the changes. It is possible to create a trigger to notify you when a specific event occurs in the database. For example, in a technical support system, you might send e-mail to the person responsible for dispatching technical staff, to inform that person that a request for technical support has been received. In an inventory system, you might automatically generate a purchase order if the quantity of an inventory item falls below the specified level. Triggers are suitable for computing and storing calculated columns, running totals, and other aggregates in the database. For example, to speed up reporting, you might decide to keep a total of ordered items in an order table.
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